Sliced Sprite support for clipping masks

[Megaloadon98]

Hey,
This shouldn't be too hard to do and I already asked in the q&a if this is already possible with some workaround.

At the moment you can use textures for clipping masks, however for masking out dynamic panels it would be cool if that would also work for 9 sliced sprites, similar to the texture/sprite option in the image selection. The idea is to use custom alpha panel borders without weird stretching when changing the size. Ill add an image of what the problem with stretching looks like right now and were the input field for sliced sprites could be in the clipping mask options.

Thanks!

The stretching when using a texture as clipping mask (no sliced option):

Were I'd imagine a sprite import option similar to the image section:

What I'd like to do in engine (various panel shapes):